[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

data_structures/binary_tree/red_black_tree.py

@@ -355,7 +355,6 @@ def check_color_properties(self) -> bool:
         # Property 5
         return self.black_height() is not None
 
-    
     def check_coloring(self) -> bool:
         """Check if the tree satisfies Red-Black property 4."""
         if self.color == 1 and 1 in (color(self.left), color(self.right)):